Lamp lock



Feb. 16 1926. 1,573,717

c. KILLARS v LAMP LOCK Filed August 5, 1922 I l/Vl/E/VTOR Char Lea.KiZZczrs WITNESSES ATITORNEYS Patented Feb. 16, 1926.

v UNITED STATE S PATENT OFFICE,

CHARLES KILLARS, or sr'omn'e'ron, CONNECTICUT.

LAMP nocx. 2

Application filed August 5, 1922.. Serial No. 579,921.

' as it securely holds the lamp in the socket hereinafter ing myimprovements in positionon the against retrograde movement, and-can notbe removed without destroying the lamp.

A further objectis to provide improvements of the character stated,which can be installed at a reasonablylow price, which will notinterfere with the insertion of the lamp in the socket, but which willabsolutely prevent unauthorized removalwithout damaging the lamp.

With these and other objects in view, the

invention consists in certain novel features of construction andcombinations, and arrangement of parts, as will be more fully describedand pointed out in the claims. v

In the accompanying drawings- Figure 1 is a view in side elevationshoW-.

electric lamp.

Figure 2is a tudinal section on the line 2--2, of Figure 1. Figure 3 isa view in transverse section on the line'-3-3, of Figure 1. Y

Figure 4 is a perspective view of the bar 8.

1 represents alamp or bulbof any form and 2 is the screw threaded lampshell to which the filament terminal 3 is secured and grounded as shownat 4, which is the customary form of construction.

The threaded portion of the shell 2 is.

provided with .a plurality of inwardly offset portions 5, the metalbeing slit as shown at 6 to permit said offset portions to be formed,and these ofi'set portions constitute a guide for a draw bar 8, thelower end of the latter being preferably provided with an eye 9 toreceive a hook or other tool to permit forcible withdrawal thereof.

This draw-bar 8 is formed with av notch 10 receiving the terminal wire 3therein so fragmentary view in longi-' "and scope of the appendedclaims. Figure. 5 is a perspective-view oft'the spur 7.

that the withdrawal of the bar 8 will serve 1 to sever or break the wire3 an(l destroy the efiic-iency'bf the lamp. 7 represents a sharp endspur, see Fig. 5,

which is projected through a slot 11 in the screw threaded portion ofshell 2 and is fo med with a pair of slits'12 and a laterally ofi'setportion '13 through which a laterally offset tongue 14 on the bar 8projects, and this coupling of the spur 7 and bar 8 serves to maintainthe sharp end of the spur projected from the, shell and in position tobite into the socket (not shown) when any attempt is made to unscrew theshell. It is apparent that the shell can be readily screwed into thesocket, asthe spur will act as a ratchet and not interfer with this operation, but any at'tempt'to unscrew the shell will'force thespur intothe thin wall of the prevent removal of the lamp. I

socket asindicated clearly in" Figure 3, and

the bar 8 withdrawing the lug 14 from the:

ofiset portion 13 of'spu'r 7 -and in'doin so,

s necessary to the terminal wire 3 will be severe "or" broken, so thatthe lamp will be out of com mission.' -When'the bar 8 is removedtheli'aspur is free to move inwardl and will'not described without departingfrom my .inwvention, and-hence I do" not limit myself to the precisedetails set forth, but consider myself at liberty to make-such changes;and

interfere with the removal 0 the lamp. I-

alterations as, fairly fall within the spirit 5 I claim: a

1. A look for vincandescent .lainps, i;com-

prising a lamp shell, a'transversely ositioned 'shar spur normallliy.projectinmm the wall 0 the shell, an movable bar having means normal :1.Ion tu' inally' iiy hcilding the spur in projected position; and having,means engaglng the filament, terminal of minal fixed to the shell, asharp spur projecting through the shell, a longitudinally positioned barcoupled to the spur and holding it inv projected position, said barhaving a notched portion receiving the filament terminal of the. lampwhereby a longitudinal pull of the bar to release the spur will operateto sever the ground connection of the. filament terminal with the shell.

3. A lamp, a shell on the lamp, inwardly ofi'set portions in the shell,a bar positioned in said offset portions, a transversely posibetween theterminal and the shell.

4%. A lamp lock, comprising a lamp shell, a spur projecting through theshell, a spur holding bar longitudinally movable in the shell, and alamp filament terminal carried by the shell and engaging the bar andsevered thereby when the release the spur.

5. A lamp lock, comprising a screw threaded lamp' shell, locking meansfor the shell, said means permitting the shell to be screwed into asocket but preventing it from being unscrewed therefrom, and meansslidbar is moved to ably mounted in the shell and operable from theexterior of the shell for rendering the locking means operative andinoperative.

6. A lamp lock, comprising-a screw threaded shell, locking means for theshell, said means permitting the shell to be screwed into a socket, butpreventing it from being unscrewed therefrom, and means slidably mountedin the shell and operable from the exterior of the shellfor renderingthe locking means operative and simultaneously therewith severing thefilament terminal of the lamp.

7. In an incandescent lamp, a shell, means for locking the shell on thelamp anda member movably mounted in theshell and operable from theexterior thereof, said member controlling the locking means and havingmeans for severing the filament terminal of the lamp when operated torender the locking means operative.

8. In an incandescent lamp, a shell, means for locking the shell on thelamp, and a bar slidably mounted in the shell and operable from theexterior thereof, said bar controlling the locking means and having anotch for receiving the filament terminal'ol the lamp, whereby when thebar is partly withdrawn from the shell to release the locking means thefilament will be severed.

CHARLES KILLARS.

